<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>计算商品小计案例</title>
</head>

<body>
  <script>
    let price = prompt('请输入商品价格')
    let num = prompt('请输入数量')
    let result = price * num
    document.write(`小计：￥${result}`)

  </script>
</body>

</html>